freeotfecyphertwofish_gladman.c

来自「文件驱动加密,功能强大,可产生加密分区,支持AES,MD2,MD4,MD5MD2」· C语言 代码 · 共 293 行

// Description: 
// By Sarah Dean
// Email: [e-mail]
// WWW:   http://www.FreeOTFE.org/
//
// -----------------------------------------------------------------------------
//

#ifndef WINCE
#include <ntddk.h>
#endif

#include "FreeOTFECypherTwofish_Gladman.h"

#include "FreeOTFECypherImpl.h"
#include "FreeOTFECypherAPICommon.h"

#ifdef WINCE
#include "FreeOTFE4PDACypherDriver.h"  // Required for DRIVER_CYPHER_VERSION
#else
#include "FreeOTFECypherDriver.h"  // Required for DRIVER_CYPHER_VERSION
#endif

#include "FreeOTFEPlatform.h"
#include "FreeOTFEDebug.h"
#include "FreeOTFElib.h"


// Include Gladman library...
#include <aes_defs.h>
#include <twofish.h>


// =========================================================================
// Cypher driver init function
// driverInfo - The structure to be initialized
NTSTATUS
ImpCypherDriverExtDetailsInit(
    IN OUT CYPHER_DRIVER_INFO* driverInfo
)
{
    NTSTATUS status = STATUS_SUCCESS;
    int idx = -1;

    DEBUGOUTCYPHERIMPL(DEBUGLEV_ENTER, (TEXT("ImpCypherDriverExtDetailsInit\n")));


    // -- POPULATE DRIVER IDENTIFICATION --
    FREEOTFE_MEMZERO(driverInfo->DriverTitle, sizeof(driverInfo->DriverTitle));
    FREEOTFE_MEMCPY(
                  driverInfo->DriverTitle,
                  DRIVER_TITLE,
                  strlen(DRIVER_TITLE)
                 );

    driverInfo->DriverGUID = DRIVER_GUID;
    driverInfo->DriverVersionID = DRIVER_CYPHER_VERSION;


    // -- POPULATE cyphers SUPPORTED --
    driverInfo->CypherDetails = FREEOTFE_MEMALLOC((sizeof(CYPHER) * CYPHERS_SUPPORTED));    

    driverInfo->CypherCount = CYPHERS_SUPPORTED;


    // -- Twofish-128 --
    idx++;
    FREEOTFE_MEMZERO(driverInfo->CypherDetails[idx].Title, MAX_CYPHER_TITLE);
    FREEOTFE_MEMCPY(
                  driverInfo->CypherDetails[idx].Title,
                  DRIVER_CIPHER_TITLE_TWOFISH_128,
                  strlen(DRIVER_CIPHER_TITLE_TWOFISH_128)
                 );

    driverInfo->CypherDetails[idx].Mode       = CYPHER_MODE_CBC;
    driverInfo->CypherDetails[idx].KeySize    = 128;
    driverInfo->CypherDetails[idx].BlockSize  = TWOFISH_BLOCK_SIZE;
    driverInfo->CypherDetails[idx].VersionID  = DRIVER_CYPHER_IMPL_VERSION;
    driverInfo->CypherDetails[idx].CypherGUID = CIPHER_GUID_TWOFISH_128;


    // -- Twofish-192 --
    idx++;
    FREEOTFE_MEMZERO(driverInfo->CypherDetails[idx].Title, MAX_CYPHER_TITLE);
    FREEOTFE_MEMCPY(
                  driverInfo->CypherDetails[idx].Title,
                  DRIVER_CIPHER_TITLE_TWOFISH_192,
                  strlen(DRIVER_CIPHER_TITLE_TWOFISH_192)
                 );

    driverInfo->CypherDetails[idx].Mode       = CYPHER_MODE_CBC;
    driverInfo->CypherDetails[idx].KeySize    = 192;
    driverInfo->CypherDetails[idx].BlockSize  = TWOFISH_BLOCK_SIZE;
    driverInfo->CypherDetails[idx].VersionID  = DRIVER_CYPHER_IMPL_VERSION;
    driverInfo->CypherDetails[idx].CypherGUID = CIPHER_GUID_TWOFISH_192;


    // -- Twofish-256 --
    idx++;
    FREEOTFE_MEMZERO(driverInfo->CypherDetails[idx].Title, MAX_CYPHER_TITLE);
    FREEOTFE_MEMCPY(
                  driverInfo->CypherDetails[idx].Title,
                  DRIVER_CIPHER_TITLE_TWOFISH_256,
                  strlen(DRIVER_CIPHER_TITLE_TWOFISH_256)
                 );

    driverInfo->CypherDetails[idx].Mode       = CYPHER_MODE_CBC;
    driverInfo->CypherDetails[idx].KeySize    = 256;
    driverInfo->CypherDetails[idx].BlockSize  = TWOFISH_BLOCK_SIZE;
    driverInfo->CypherDetails[idx].VersionID  = DRIVER_CYPHER_IMPL_VERSION;
    driverInfo->CypherDetails[idx].CypherGUID = CIPHER_GUID_TWOFISH_256;


    DEBUGOUTCYPHERIMPL(DEBUGLEV_EXIT, (TEXT("ImpCypherDriverExtDetailsInit\n")));

    return status;
}


// =========================================================================
// Cypher driver cleardown function
// driverInfo - The structure to be cleared down
NTSTATUS
ImpCypherDriverExtDetailsCleardown(    
    IN OUT CYPHER_DRIVER_INFO* driverInfo
)
{
    NTSTATUS status = STATUS_SUCCESS;

    DEBUGOUTCYPHERIMPL(DEBUGLEV_ENTER, (TEXT("ImpCypherDriverExtDetailsCleardown\n")));

    if (driverInfo->CypherDetails != NULL)
        {
        FREEOTFE_FREE(driverInfo->CypherDetails);
        }

    driverInfo->CypherDetails = NULL;
    driverInfo->CypherCount = 0;

    DEBUGOUTCYPHERIMPL(DEBUGLEV_EXIT, (TEXT("ImpCypherDriverExtDetailsCleardown\n")));

    return status;
}


// =========================================================================
// Encryption function
// Note: CyphertextLength must be set to the size of the CyphertextData buffer on
//       entry; on exit, this will be set to the size of the buffer used.
NTSTATUS
ImpCypherEncryptData(
    IN      GUID* CypherGUID,
    IN      int KeyLength,  // In bits
    IN      char *Key,
    IN      char *KeyASCII,  // ASCII representation of "Key"
    IN      int IVLength,  // In bits
    IN      char *IV,
    IN      int PlaintextLength,  // In bytes
    IN      char *PlaintextData,
    OUT     char *CyphertextData
)
{
    NTSTATUS status = STATUS_SUCCESS;
    // Null IV in case we're not given an IV
    char zeroIV[FREEOTFE_MAX_CYPHER_BLOCKSIZE];
    char tmpBuffer[(TWOFISH_BLOCK_SIZE / 8)];
    int i;

    DEBUGOUTCYPHERIMPL(DEBUGLEV_ENTER, (TEXT("ImpCypherEncryptData\n")));

    if (!(
          (IsEqualGUID(&CIPHER_GUID_TWOFISH_128, CypherGUID)) || 
          (IsEqualGUID(&CIPHER_GUID_TWOFISH_192, CypherGUID)) ||
          (IsEqualGUID(&CIPHER_GUID_TWOFISH_256, CypherGUID))
         ))
        {
        DEBUGOUTCYPHERIMPL(DEBUGLEV_ERROR, (TEXT("Unsupported cipher GUID passed in.\n")));
        status = STATUS_INVALID_PARAMETER;
        }
    else
        {
        // Handle situation where a NULL/zero length IV is passed in
        if ( (IVLength == 0) || (IV == NULL) )
            {
            FREEOTFE_MEMZERO(&zeroIV, sizeof(zeroIV));
            IV = (char*)&zeroIV;
            }


        // Process data using CBC mode
        //
        // CBC Mode ENCRYPT:
        // *) Setup key
        // *) For each block...
        //     *) XOR plaintext with IV
        //     *) Encrypt XOR'd plaintext with key
        //     *) IV = The just encrypted data

        // Note: "enc" specified; we're ENCRYPTING
        // Note: We use a temp buffer (tmpBuffer) because we can't write to
        //       PlaintextData
        TWOFISH(set_key(Key, KeyLength, enc));
        for (i=0; i < PlaintextLength; i += (TWOFISH_BLOCK_SIZE / 8))
            {
            XORBlock(PlaintextData+i, IV, tmpBuffer, (TWOFISH_BLOCK_SIZE / 8));
            TWOFISH(encrypt(tmpBuffer, CyphertextData+i));
            IV = CyphertextData+i;
            }

        SecZeroMemory(tmpBuffer, sizeof(tmpBuffer));
        }


    DEBUGOUTCYPHERIMPL(DEBUGLEV_EXIT, (TEXT("ImpCypherEncryptData\n")));

    return status;
}


// =========================================================================
// Decryption function
// Note: PlaintextLength must be set to the size of the PlaintextData buffer on
//       entry; on exit, this will be set to the size of the buffer used.
NTSTATUS
ImpCypherDecryptData(
    IN      GUID* CypherGUID,
    IN      int KeyLength,  // In bits
    IN      char *Key,
    IN      char *KeyASCII,  // ASCII representation of "Key"
    IN      int IVLength,  // In bits
    IN      char *IV,
    IN      int CyphertextLength,  // In bytes
    IN      char *CyphertextData,
    OUT     char *PlaintextData
)
{
    NTSTATUS status = STATUS_SUCCESS;
    // Null IV in case we're not given an IV
    char zeroIV[FREEOTFE_MAX_CYPHER_BLOCKSIZE];
    int i;

    DEBUGOUTCYPHERIMPL(DEBUGLEV_ENTER, (TEXT("ImpCypherDecryptData\n")));

    if (!(
          (IsEqualGUID(&CIPHER_GUID_TWOFISH_128, CypherGUID)) || 
          (IsEqualGUID(&CIPHER_GUID_TWOFISH_192, CypherGUID)) ||
          (IsEqualGUID(&CIPHER_GUID_TWOFISH_256, CypherGUID))
         ))
        {
        DEBUGOUTCYPHERIMPL(DEBUGLEV_ERROR, (TEXT("Unsupported cipher GUID passed in.\n")));
        status = STATUS_INVALID_PARAMETER;
        }
    else
        {
        // Handle situation where a NULL/zero length IV is passed in
        if ( (IVLength == 0) || (IV == NULL) )
            {
            FREEOTFE_MEMZERO(&zeroIV, sizeof(zeroIV));
            IV = (char*)&zeroIV;
            }


        // Process data using CBC mode
        //
        // CBC Mode DECRYPT:
        // *) Setup key
        // *) For each block...
        //     *) Decrypt cyphertext with key
        //     *) XOR output plaintext with IV
        //     *) IV = Cyphertext data

        // Note: "dec" specified; we're DECRYPTING
        TWOFISH(set_key(Key, KeyLength, dec));
        for (i=0; i < CyphertextLength; i += (TWOFISH_BLOCK_SIZE / 8))
            {
            TWOFISH(decrypt(CyphertextData+i, PlaintextData+i));
            XORBlock(PlaintextData+i, IV, PlaintextData+i, (TWOFISH_BLOCK_SIZE / 8));
            IV = CyphertextData+i;
            }

        }


    DEBUGOUTCYPHERIMPL(DEBUGLEV_EXIT, (TEXT("ImpCypherDecryptData\n")));

    return status;
}


// =========================================================================
// =========================================================================